Well said head Barman. Very well said in fact.
From my own learning, the start point is so critical - and now speaking as I have abandoned my own
1910s bike project. It's a time when a lot was manufactured in-house and transferability between bikes which we take for granted, even of the same period is limited. I calculated to really get one good vintage bike running without bursting the bank would require buying about three vintage bikes, travelling up and down the country for recent barn finds, and spending a lot of time with a wire brush and on-line for a long time scanning for parts and doner bikes.
It's a very very niche area - it requires a lot of dedication. Even if you are into riders and can wrench like
@Nabeaquam you are still competing with very serious collectors and museums for the oddest sort after parts. I think it's a niche with fewer players but more serious players who know the subject inside out.
This rider sold very recently on Ebay.fr - 1920s / 1930s Peugeot for 400€ which I thought was rather low, perhaps more of a reflection of economic times? I'm sure the seller would have been disappointed with that considering the effort put in. Tyres alone are very rare.
https://www.ebay.fr/itm/165739177923
Will never forget this jaw dropping Dion - Bouton in the USA. Only 3500 USD, but I can see why. There's probably not another like it.
@dirttorpedo - I think if you get involved in this, be very conscious of the $ / mile - my recommendation would be try to get lucky in your own barn find and take it from there. Look in places where no one else is looking